[3c7ed6b] | 1 | /** |
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| 2 | * @file irq.c |
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| 3 | * |
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| 4 | * This file contains the implementation of the function described in irq.h. |
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| 5 | */ |
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| 6 | /* |
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| 7 | * RTEMS GBA BSP |
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| 8 | * |
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| 9 | * Copyright (c) 2002 by Jay Monkman <jtm@smoothsmoothie.com> |
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| 10 | * |
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| 11 | * Copyright (c) 2002 by Charlie Steader <charlies@poliac.com> |
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| 12 | * |
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| 13 | * Copyright (c) 2004 by Markku Puro <markku.puro@kopteri.net> |
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| 14 | * |
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| 15 | * The license and distribution terms for this file may be |
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| 16 | * found in found in the file LICENSE in this distribution or at |
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| 17 | * http://www.rtems.com/license/LICENSE. |
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| 18 | * |
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| 19 | * $Id$ |
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| 20 | */ |
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| 21 | |
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| 22 | #include <bsp.h> |
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| 23 | #include <irq.h> |
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| 24 | #include <gba_registers.h> |
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| 25 | #include <rtems/score/thread.h> |
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| 26 | #include <rtems/score/apiext.h> |
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| 27 | |
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| 28 | |
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| 29 | /** |
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| 30 | * @brief isValidInterrupt function check that the value given for the irq line is valid. |
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| 31 | * |
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| 32 | * @param irq irq number |
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| 33 | * @return status code TRUE/FALSE (0/1) |
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| 34 | */ |
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| 35 | static int isValidInterrupt(int irq) |
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| 36 | { |
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| 37 | if ( (irq < 0) || (irq > BSP_MAX_INT)) { |
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| 38 | return 0; |
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| 39 | } |
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| 40 | return 1; |
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| 41 | } |
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| 42 | |
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| 43 | /* |
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| 44 | * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- |
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| 45 | */ |
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| 46 | |
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| 47 | |
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| 48 | /** |
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| 49 | * @brief BSP_install_rtems_irq_handler function install rtems irq handler. |
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| 50 | * |
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| 51 | * @param irq irq connect data |
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| 52 | * @return status code TRUE/FALSE (0/1) |
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| 53 | */ |
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| 54 | int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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| 55 | { |
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| 56 | rtems_irq_hdl *HdlTable; |
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| 57 | rtems_interrupt_level level; |
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| 58 | |
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| 59 | if (!isValidInterrupt(irq->name)) { |
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| 60 | return 0; |
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| 61 | } |
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| 62 | /* |
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| 63 | * Check if default handler is actually connected. If not issue an error. |
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| 64 | */ |
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| 65 | HdlTable = (rtems_irq_hdl *) (unsigned32)VECTOR_TABLE; |
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| 66 | if (*(HdlTable + irq->name) != default_int_handler) { |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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| 70 | _CPU_ISR_Disable(level); |
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| 71 | |
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| 72 | /* |
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| 73 | * store the new handler |
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| 74 | */ |
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| 75 | *(HdlTable + irq->name) = irq->hdl; |
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| 76 | |
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| 77 | /* |
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| 78 | * ack pending interrupt |
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| 79 | */ |
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| 80 | GBA_REG_IF |= (1 << (irq->name)); |
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| 81 | |
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| 82 | /* |
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| 83 | * initialize the control register for the concerned interrupt |
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| 84 | */ |
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| 85 | GBA_REG_IE |= (1 << (irq->name)); |
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| 86 | |
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| 87 | /* |
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| 88 | * Enable interrupt on device |
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| 89 | */ |
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| 90 | irq->on(irq); |
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| 91 | |
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| 92 | _CPU_ISR_Enable(level); |
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| 93 | |
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| 94 | return 1; |
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| 95 | } |
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| 96 | |
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| 97 | /** |
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| 98 | * @brief BSP_remove_rtems_irq_handler function removes rtems irq handler. |
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| 99 | * |
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| 100 | * @param irq irq connect data |
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| 101 | * @return status code TRUE/FALSE (0/1) |
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| 102 | */ |
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| 103 | int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) |
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| 104 | { |
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| 105 | rtems_irq_hdl *HdlTable; |
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| 106 | rtems_interrupt_level level; |
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| 107 | |
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| 108 | if (!isValidInterrupt(irq->name)) { |
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| 109 | return 0; |
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| 110 | } |
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| 111 | /* |
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| 112 | * Check if the handler is actually connected. If not issue an error. |
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| 113 | */ |
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| 114 | HdlTable = (rtems_irq_hdl *) (unsigned32)VECTOR_TABLE; |
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| 115 | if (*(HdlTable + irq->name) != irq->hdl) { |
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| 116 | return 0; |
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| 117 | } |
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| 118 | _CPU_ISR_Disable(level); |
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| 119 | |
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| 120 | /* |
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| 121 | * mask at INT controller level |
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| 122 | */ |
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| 123 | GBA_REG_IE &= ~(1 << irq->name); |
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| 124 | |
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| 125 | /* |
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| 126 | * Disable interrupt on device |
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| 127 | */ |
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| 128 | irq->off(irq); |
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| 129 | |
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| 130 | /* |
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| 131 | * restore the default irq value |
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| 132 | */ |
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| 133 | *(HdlTable + irq->name) = default_int_handler; |
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| 134 | |
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| 135 | _CPU_ISR_Enable(level); |
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| 136 | |
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| 137 | return 1; |
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| 138 | } |
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| 139 | |
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| 140 | |
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| 141 | /** |
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| 142 | * @brief _ThreadProcessSignalsFromIrq function check that the value given for the irq line is valid. |
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| 143 | * |
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| 144 | * @param cxt exeption frame |
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| 145 | * @return None |
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| 146 | */ |
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| 147 | void _ThreadProcessSignalsFromIrq (CPU_Exception_frame* ctx) |
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| 148 | { |
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| 149 | /* |
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| 150 | * Process pending signals that have not already been |
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| 151 | * processed by _Thread_Dispatch. This happens quite |
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| 152 | * unfrequently : the ISR must have posted an action |
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| 153 | * to the current running thread. |
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| 154 | */ |
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| 155 | if ( _Thread_Do_post_task_switch_extension || |
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| 156 | _Thread_Executing->do_post_task_switch_extension ) |
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| 157 | { |
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| 158 | _Thread_Executing->do_post_task_switch_extension = FALSE; |
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| 159 | _API_extensions_Run_postswitch(); |
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| 160 | } |
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| 161 | } |
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